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diff --git a/content/posts/daemonize-and-autostart-under-debian-and-rhel.rst b/content/posts/daemonize-and-autostart-under-debian-and-rhel.rst new file mode 100644 index 0000000..6cfdd67 --- /dev/null +++ b/content/posts/daemonize-and-autostart-under-debian-and-rhel.rst @@ -0,0 +1,205 @@ +Daemonize and Autostart under Debian and RHEL +############################################# + +:date: 2012-04-05 11:57 +:tags: debian,redhat,autostart + +Daemonizing and autostarting a process is still a pain in the ass, so +here are two scripts which can be placed under /etc/init.d and if you +are lucky everything will work. + + +Example is the punani backend, an universal package resolver and installer +which is essentially a python webserver (now obsolete). + +debian init-script +================== + +.. code-block:: bash + + #! /bin/sh + # uses template from /etc/init.d/skeleton + ### BEGIN INIT INFO + # Provides: punani + # Required-Start: + # Required-Stop: + # Default-Start: 2 3 4 5 + # Default-Stop: 0 1 6 + # Short-Description: punani + # Description: starts punani daemon + # + ### END INIT INFO + + PATH=/sbin:/usr/sbin:/bin:/usr/bin + NAME=punani + DESC="$NAME daemon" + DAEMON=/usr/bin/python + DAEMON_ARGS="/krebs/punani/index.py" + PIDFILE=/var/run/$NAME.pid + SCRIPTNAME=/etc/init.d/$NAME + + [ -x "$DAEMON" ] || exit 0 + [ -r /etc/default/$NAME ] && . /etc/default/$NAME + . /lib/init/vars.sh + . /lib/lsb/init-functions + + do_start() + { + # 0 if daemon has been started + # 1 if daemon was already running + # 2 if daemon could not be started + start-stop-daemon -b --start --quiet --make-pidfile --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \ + || return 1 + start-stop-daemon -b --start --quiet --make-pidfile --pidfile $PIDFILE --exec $DAEMON -- \ + $DAEMON_ARGS \ + || return 2 + } + + do_stop() + { + # 0 if daemon has been stopped + # 1 if daemon was already stopped + # 2 if daemon could not be stopped + start-stop-daemon --stop --retry=TERM/30/KILL/5 --pidfile $PIDFILE + RETVAL="$?" + [ "$RETVAL" = 2 ] && return 2 + rm -f $PIDFILE + return "$RETVAL" + } + + do_reload() { + start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE + return 0 + } + + case "$1" in + start) + [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME" + do_start + case "$?" in + 0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;; + 2) [ "$VERBOSE" != no ] && log_end_msg 1 ;; + esac + ;; + stop) + [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME" + do_stop + case "$?" in + 0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;; + 2) [ "$VERBOSE" != no ] && log_end_msg 1 ;; + esac + ;; + status) + status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $? + ;; + restart|force-reload) + log_daemon_msg "Restarting $DESC" "$NAME" + do_stop + case "$?" in + 0|1) + do_start + case "$?" in + 0) log_end_msg 0 ;; + 1) log_end_msg 1 ;; + *) log_end_msg 1 ;; + esac + ;; + *) + # Failed to stop + log_end_msg 1 + ;; + esac + ;; + *) + echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2 + exit 3 + ;; + esac + + : + + +register the script +------------------- + +.. code-block:: bash + + update-rc.d punani defaults + service punani start + +RHEL Init Script +================ + +.. code-block:: bash + + #!/bin/bash + # `forked` (read stolen) from http://bitten.edgewall.org/wiki/BittenSlaveDaemonRedhat + # + # processname: punani + # config: /krebs/punani/config.json + # pidfile: /var/run/punani.pid + # chkconfig: 2345 99 01 + # description: punani daemon + + # Source function library. + . /etc/rc.d/init.d/functions + + PATH=/sbin:/usr/sbin:/bin:/usr/bin + DESC="punani daemon" + NAME=punani + DAEMON=/usr/bin/python + DAEMON_ARGS="/krebs/punani/index.py" + DAEMON_USER=nobody + PIDFILE=/var/run/$NAME.pid + + [ -x "$DAEMON" ] || exit 0 + + [ -r /etc/sysconfig/$NAME ] && . /etc/sysconfig/$NAME + + start() { + echo -n $"Starting $NAME: " + daemon --user="$DAEMON_USER" --pidfile="$PIDFILE" "$DAEMON $DAEMON_ARGS &" # daemonize here + RETVAL=$? + pid=`ps -A | grep $NAME | cut -d" " -f2` + pid=`echo $pid | cut -d" " -f2` + if [ -n "$pid" ]; then + echo $pid > "$PIDFILE" + fi + echo + return $RETVAL + } + stop() { + echo -n $"Stopping $NAME: " + killproc -p "$PIDFILE" -d 10 "$DAEMON" + RETVAL="$?" + echo + [ $RETVAL = 0 ] && rm -f "$PIDFILE" + return "$RETVAL" + } + + case "$1" in + start) + start + ;; + stop) + stop + ;; + restart) + stop + start + ;; + *) + echo "Usage: $NAME {start|stop|restart}" >&2 + exit 1 + ;; + esac + + exit $RETVAL + +register RHEL init-config +------------------------- + +.. code-block:: bash + + chkconfig punani on + service punani start |